Videokeratoscope Accuracy and its Potential Use in Corneal Optics Research

摘要

An investigation was conducted to determine if the EyeSys Corneal Analysis System could measure the topographic elevation of cornea-like test surfaces accurately enough to permit detailed studies of corneal optics. For this purpose, elevation measurement accuracy should be better than 1.0 micron. Six rotationally symmetric apheric test surfaces were measured to assess instrument accuracy. Our results showed the EyeSys system was not able to achieve this level of accuracy for any of the test surfaces. Depending on the surface, accuracies expressed as RMS or 12th ring errors were in the 2 to 9 and -2 to -6 microns ranges, respectively.